Radioindicator



May 14, 1929.V c. F. NEHRKE RADIO INDICATOR 2 sheets-sheet l Filed June 15, 1927 C. F. NEHRKE RADIO INDICATOR Mqy 14, 1929.

Filed June 15, 1927 2 Sheets-Sheet 2 W /f C ORNEY suitable graduationor identification marks such as are indicated in Fig. 2 through the` adjacent to the panel l0 and back of-thegraduated portion of the dial is a source of light 32 which preferably may be any suitable type of electric lamp in circuit with the A battery of the machine or otherwlse. 33 indicates the lever of a switch for closing or opening the circuit through the lamp. T'ne lamp is located so as to have lts axis projecting forward through the slot 26 and hole 30.

As thus far described the invention as to its mode of operation may be briefiy summarized as follows: With the parts constructed as described and with a film 28 located in the pocket or keeper 27 between the `hole 30 and the slot 26, the tuning or adjustment of the instrument will be performed in accordance with the usual practice b the turning of the knob 24 one way or the ot 1er until the desired station is determined. When so properly adjusted, the operator by the means of a p in or equivalent'sharp pointed instrument will .prick through the hole 30 and make a small perforation 28a in the film 28. 'At any subsequent adjustment or tuning for the same station therefore, the operator may turn the dial until he observes a ray or gleam of light from the lamp 32 through the registermg holes 28l and 30. And this either with or without observing the reading ofthe scale.

Another reason for making the dial and film mechanism easily accessible, as by removing the shutter 21, is to enable the operator toslip between the film andthe main portion of the disk or dial 22, bits of colored materials such as thin Celluloid. With a sufficient number of these bits of Celluloid or pieces of colored material, anumber equivalent perhaps to the total number of stations that may be patronized, a distinctly different color for each station, the adjustment of the dial after the colored bits have been inserted will cause the distinctive color of light to be emitted through the peep hole 30. Hence the operator will be able to tune for any familiar station even in the dark when he may be unable to read the marks on the scale,

simply by observing the different colors of light. It will of course be understood that the colored bit will be inserted into its place after the hole 28a is formed so that. the colored bit will not be erforated or punctured.

In the modigcation of Figs. 4 and 5, the same inventive idea is disclosed, but with a changed form of movable indicator or carrier. In the modified form a drum shaped carrier 2 2* lis provided, the same having a fiange 22b projecting forward through a slot 35 formed in a face plate 36 mounted on the front-of the cabinet. This face plate corresponds broadly to the shutter 2l above described, it being provided with a depression or socket 29 and a hole 30 adjacent to which is the pointer 3l registering with a series or succession of spaces for station indicia indicated at 37 on the cylindrical face of the member 22a, the main portion of which is preferably of white or opal colored celluloid 38 through which li ht from the lamp 32 within the carrier is ma e visible through the translucency or partial transparency of the strip of material 38. Along one edge of this strip or constituting in effect a lateral extension thereof is a narrow strip of opaque material 28b which when the carrier is turned around its axis is caused to move along just back of the perforation 30 and through which the sharp pointed instrument may cause to be made a series of prick marks or holes 28"L through which the light will shine as above described from the lamp 32. These holes 28 correspond as already described to the names or initials of the several stations which are lindicated in succession by the pointer 3l.

In Figs. 6 and 7 I show a variation of indicator means including a graduated disk 22 mounted back of or within the casing panel 10, the same being fitted with a window plate 39 having a series of radial holes 40 and a window 41. The window registers with an arcshaped scale 42 carried by the dial or disk, and 43 indicates an arc-shaped strip of opaque material or film ust back of the series of holes 40. 44 indicates a plate carried by the fixedstructure and having a slot 44 registerin with the holes 40 and lying back thereof. his plate and slot provides a backing so that the strip 43 may be punctured with a sharp pointed instrument through any one of the radial holes 4() or combination of such holes as indicated at the right side portion of Fig. G. Back of the plate 44 is a rim 45 composed of a succession of various colors of translucent material somewhat as described above,\but of larger scope so that the may be thought of as being fields for the in ication of groups of stations. By

in each series of holes 40 may be employed without danger of puncturing the colored plate. More definitely, considering one of the bits of color as the basis for a group of stations, the several stations in the group will be identified or distinguished from one another by the number and location of the perforations made at 43. It is therefore readily possible and expedient for any reasonable number of independent stations to be distinguished by the light indications alone after the proper markin s are made by the-puncturing instrument. his form also includes a lamp V32 with a suitable switch in the fOrm oit a .screw7 33'. The switch mechanism in all torins ont the invention helng conventional, is

y not shown in detail.,

' control means to move with said device, said dial having markings adapted to he seen through said Window, said dial being adapted to he easily punctured in the aforesaid position loy a tool inserted through the panel pin hole, said dial havin a series of pin holes punctured therein an registering successively with the casing pin hole, the 'dial pin holes heing correlated with the said markings for indicatiin the setting of the device and a source oiight to the rear of the' dial, the light whereof is visible through the casing pin hole when a pair of pin holes are in registry..

2. In an instrument indicator ont the character set forth, a casing having a pin hole, control means adapted to operate a tuning device mounted on the rear side of the casing, an opa ue dial mounted at the rear of the casing an ada ted to move with said device, said dial hein adapted to loe easily punc tured in the a oresaid position ley a tool inn serted through the casing pin hole, said dial having a series of pin. holes therein adapted to successively register with the casing pin hole on movement of the control means, materials of diderent colors associated with the dial pin holes, and a source ot light to the rear of the dial, the light from Which'can loe seen in various colors through the casing pin hole to indicate the setting ot the device.

In testimony whereof l ail-ix my signature.

CHARLES F. NEHRM` 1 

